Nat Commun:MCR4突变能够提高人们对脂肪的喜爱程度

2016-10-08 佚名 生物谷

(图片摘自www.sciencealert.com)科学家们通过"随心所欲"的自助餐试验检测了那些罕见的基因突变能够影响人们的胃口。结果显示:一些天生存在的基因突变能够使得我们对脂肪类的食物十分敏感,但会降低我们对糖类食物的喜好程度。虽然我们大部分喜欢的食物中都富含脂肪,但该研究显示人们体内的一类叫做MCR4基因的突变能够使得其相对其它群体更加偏好脂肪,即使食物中的脂肪成分并不明显。"我们的研究表


(图片摘自www.sciencealert.com)

科学家们通过"随心所欲"的自助餐试验检测了那些罕见的基因突变能够影响人们的胃口。结果显示:一些天生存在的基因突变能够使得我们对脂肪类的食物十分敏感,但会降低我们对糖类食物的喜好程度。

虽然我们大部分喜欢的食物中都富含脂肪,但该研究显示人们体内的一类叫做MCR4基因的突变能够使得其相对其它群体更加偏好脂肪,即使食物中的脂肪成分并不明显。

"我们的研究表明,尽管我们严格控制食物中的各种成分的存在以及其味道,但大脑还是会敏感地识别其中的营养成分",来自剑桥大学的首席研究者Sadaf Farooqi说道。

Farooqi研究团队招募了54名志愿者参加一次咖喱鸡肉自助餐活动。在这些志愿者中,有20名体型消瘦,20名较为肥胖,还有14名不仅肥胖而且存在MCR4基因突变。

根据研究者们的说法,MCR4基因突变在人群中的比例为1%。这一突变会使得他们相比其他群体更加容易肥胖。MCR4的突变能够影响受体下游的信号,因而使得大脑的"满足"信号受到了紊乱。

在实验中,三组参与者们同时被给予了三种不同的咖喱鸡肉餐,它们从外观以及口感上几乎相同,但其中脂肪的分布则存在明显差异(20%, 40%, 60%)。

在试吃之后,参与者们能够随便地享用三种中的任何一种食物。

结果显示,虽然每一组参与者在食用食物的总量上相差无几,但存在MCR4基因突变的参与者则更加倾向于食用高脂肪食物,相比无突变的肥胖人群要多65%。

然而,虽然MCR4基因突变能够使得我们更加喜爱脂肪,但同时也会降低我们对糖类的摄入。

在另外一个实验中,三组参与者被要求食用含糖量不同的三组食物,结果显示,存在MCR4基因突变的参与者糖类的摄入量明显低于其他两组。

虽然此前研究者们已经知道MCR4基因的缺陷能够使得人们更加容易肥胖,但该研究起一次揭示了这一过程发生的机制,以及在MCR4基因存在突变的情况下人们对于不同类型的营养的摄入偏好。

"大部分情况下,我们的食物中既有大量的糖类,也有大量的脂肪," Farooqi说道:"我们的研究分别比较了在MCR4基因突变的情况下人们对上述两类营养物质的摄入偏好,从而揭示了大脑存在能够调节营养摄取的类型的机制"。

虽然MCR4基因缺陷对于当今的人们来说是一个没有多大作用的突变,但在进化过程中该突变可能能够促进我们对高脂肪类食物的摄取,从而提高存活的几率。

相关结果发表在《nature communication》杂志上。

原始出处:

There's a rare gene mutation that makes some of us seek out fatty foods


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    2016-12-23 liye789132251
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    2016-11-29 liuli5079
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    2016-10-08 知难而进

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    2016-10-08 知难而进

    谢谢分享!

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=2010971, encodeId=6a2a20109e12c, content=<a href='/topic/show?id=3b5140160e6' target=_blank style='color:#2F92EE;'>#喜爱程度#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=40160, encryptionId=3b5140160e6, topicName=喜爱程度)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ac1c235, createdName=tonychen21, createdTime=Thu Jul 27 17:09:00 CST 2017, time=2017-07-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1881363, encodeId=fd8418813632e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Fri Dec 23 15:09:00 CST 2016, time=2016-12-23, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2086906, encodeId=7717208690641, content=<a href='/topic/show?id=490750196b' target=_blank style='color:#2F92EE;'>#COMMUN#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5019, encryptionId=490750196b, topicName=COMMUN)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7931272, createdName=liuli5079, createdTime=Tue Nov 29 19:09:00 CST 2016, time=2016-11-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=142215, encodeId=b2bb142215af, content=继续关注!, beContent=null, objectType=article, channel=null, level=null, likeNumber=69, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160811/IMG57AC91915ACA64463.jpg, createdBy=9c351934462, createdName=知难而进, createdTime=Sat Oct 08 22:22:43 CST 2016, time=2016-10-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=142214, encodeId=318314221421, content=谢谢分享!, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160811/IMG57AC91915ACA64463.jpg, createdBy=9c351934462, createdName=知难而进, createdTime=Sat Oct 08 22:22:36 CST 2016, time=2016-10-08, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=142144, encodeId=a5c2142144a7, content=还是饮食, beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=9a3e1625700, createdName=18719ba4d5m, createdTime=Sat Oct 08 21:01:44 CST 2016, time=2016-10-08, status=1, ipAttribution=)]
    2016-10-08 18719ba4d5m

    还是饮食

    0